N5k on 4.2(1)N1(1) and N7k on 5.0(2) [build 5.0(0.66)]
A pair of N5k on active-active mode with Vlan 211 and 207 up to the N7k redundant cores. I checked the following for N7k Core1:
ospf DR master
Below is an example of a vlan config:
interface Vlan207 no shutdown no ip redirects ip address 10.100.207.2/24 ip ospf passive-interface ip router ospf 1 area 0.0.0.200 ip pim sparse-mode ip igmp version 2 hsrp 207 preempt delay minimum 180 priority 90 timers 1 3 ip 10.100.207.1 ip dhcp relay address 10.100.211.71
Both N7k and N5k has the same config below:
interface port-channel13 description TO-N5K-DC-EDGE3and4 PORTS 3/9 and 3/10**** switchport switchport mode trunk vpc 13 switchport trunk allowed vlan 203-204,207-208,211,223-224 logging event port link-status logging event port trunk-status
On the N5k, the switchport is basic:
interface Ethernet141/1/11 switchport access vlan 207 spanning-tree port type edge
. When server (2003 SP3 or 2008) on vlan 211 copies files from 207, it takes a long time. Wireshark trace shows dropped packets meaning I get a lot of "tcp previous segment loss" For example, a 1.5G files which normally take less than a minute, takes 15 minute to copy.
I tried different servers and it doesn't appear to be server related but network. I tried to turn off "checksum offload" and "large send offload" on the NIC but still a problem...there is no nic-teaming - just one nic on each server
From 10.100.211.X server, I tried a "ping 10.100.207.X -t -l 1514" and there was only a few packet drops as oppose to the ethereal trace so I am not sure if I am actually getting packet loss from the network or if it is still a server issues. I tried copy from servers on diff OS (ie 2003 versus 2008) and same problem
I also looked at perfmon during a file transfer and it looks fine.
On non-active/actvie setups, like single switch user-IDF (ie 4500, 3750., 6500) or a single N5k, which has a vpc up to the N7k cores, file transfers are fine...so it just seems to be related to my redundant N5k (active-active) topology. I tried with turning Jumbo on and off as well as setting up QoS on and off but no work. Currently Jumbo and QoS is set back to default.
I also tried file transfer btwn n5k pairs meaning N5k(active-active) pair #1 to/from N5k(active-active) pair #2 and slow file transfers....so issue seems to related only to n5k active-active topology:
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